/*
 * Copyright (C) 2007 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.example.android.apis.app;

import android.app.Activity;
import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.app.Service;
import android.content.Intent;
import android.os.Bundle;
import android.os.Handler;
import android.os.HandlerThread;
import android.os.IBinder;
import android.os.Looper;
import android.os.Message;
import android.os.Process;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;

import com.example.android.apis.R;

/**
 * This is an example of implementing an application service that runs locally
 * in the same process as the application. The {@link Controller} class shows
 * how to interact with the service.
 * 
 * <p>
 * Notice the use of the {@link NotificationManager} when interesting things
 * happen in the service. This is generally how background services should
 * interact with the user, rather than doing something more disruptive such as
 * calling startActivity().
 * 
 * <p>
 * For applications targeting Android 1.5 or beyond, you may want consider using
 * the {@link android.app.IntentService} class, which takes care of all the work
 * of creating the extra thread and dispatching commands to it.
 */
public class ServiceStartArguments extends Service {
	private NotificationManager mNM;
	private Intent mInvokeIntent;
	private volatile Looper mServiceLooper;
	private volatile ServiceHandler mServiceHandler;

	private final class ServiceHandler extends Handler {
		public ServiceHandler(Looper looper) {
			super(looper);
		}

		@Override
		public void handleMessage(Message msg) {
			Bundle arguments = (Bundle) msg.obj;

			String txt = arguments.getString("name");

			Log.i("ServiceStartArguments",
					"Message: " + msg + ", " + arguments.getString("name"));

			if ((msg.arg2 & Service.START_FLAG_REDELIVERY) == 0) {
				txt = "New cmd #" + msg.arg1 + ": " + txt;
			} else {
				txt = "Re-delivered #" + msg.arg1 + ": " + txt;
			}

			showNotification(txt);

			// Normally we would do some work here... for our sample, we will
			// just sleep for 5 seconds.
			long endTime = System.currentTimeMillis() + 5 * 1000;
			while (System.currentTimeMillis() < endTime) {
				synchronized (this) {
					try {
						wait(endTime - System.currentTimeMillis());
					} catch (Exception e) {
					}
				}
			}

			hideNotification();

			Log.i("ServiceStartArguments", "Done with #" + msg.arg1);
			stopSelf(msg.arg1);
		}

	};

	@Override
	public void onCreate() {
		mNM = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);

		Toast.makeText(this, R.string.service_created, Toast.LENGTH_SHORT)
				.show();

		// This is who should be launched if the user selects our persistent
		// notification.
		mInvokeIntent = new Intent(this, Controller.class);

		// Start up the thread running the service. Note that we create a
		// separate thread because the service normally runs in the process's
		// main thread, which we don't want to block. We also make it
		// background priority so CPU-intensive work will not disrupt our UI.
		HandlerThread thread = new HandlerThread("ServiceStartArguments",
				Process.THREAD_PRIORITY_BACKGROUND);
		thread.start();

		mServiceLooper = thread.getLooper();
		mServiceHandler = new ServiceHandler(mServiceLooper);
	}

	@Override
	public int onStartCommand(Intent intent, int flags, int startId) {
		Log.i("ServiceStartArguments",
				"Starting #" + startId + ": " + intent.getExtras());
		Message msg = mServiceHandler.obtainMessage();
		msg.arg1 = startId;
		msg.arg2 = flags;
		msg.obj = intent.getExtras();
		mServiceHandler.sendMessage(msg);
		Log.i("ServiceStartArguments", "Sending: " + msg);

		// For the start fail button, we will simulate the process dying
		// for some reason in onStartCommand().
		if (intent.getBooleanExtra("fail", false)) {
			// Don't do this if we are in a retry... the system will
			// eventually give up if we keep crashing.
			if ((flags & START_FLAG_RETRY) == 0) {
				// Since the process hasn't finished handling the command,
				// it will be restarted with the command again, regardless of
				// whether we return START_REDELIVER_INTENT.
				Process.killProcess(Process.myPid());
			}
		}

		// Normally we would consistently return one kind of result...
		// however, here we will select between these two, so you can see
		// how they impact the behavior. Try killing the process while it
		// is in the middle of executing the different commands.
		return intent.getBooleanExtra("redeliver", false) ? START_REDELIVER_INTENT
				: START_NOT_STICKY;
	}

	@Override
	public void onDestroy() {
		mServiceLooper.quit();

		hideNotification();

		// Tell the user we stopped.
		Toast.makeText(ServiceStartArguments.this, R.string.service_destroyed,
				Toast.LENGTH_SHORT).show();
	}

	@Override
	public IBinder onBind(Intent intent) {
		return null;
	}

	/**
	 * Show a notification while this service is running.
	 */
	private void showNotification(String text) {
		// Set the icon, scrolling text and timestamp
		Notification notification = new Notification(R.drawable.stat_sample,
				text, System.currentTimeMillis());

		// The PendingIntent to launch our activity if the user selects this
		// notification
		PendingIntent contentIntent = PendingIntent.getActivity(this, 0,
				new Intent(this, Controller.class), 0);

		// Set the info for the views that show in the notification panel.
		notification.setLatestEventInfo(this,
				getText(R.string.service_start_arguments_label), text,
				contentIntent);

		// We show this for as long as our service is processing a command.
		notification.flags |= Notification.FLAG_ONGOING_EVENT;

		// Send the notification.
		// We use a string id because it is a unique number. We use it later to
		// cancel.
		mNM.notify(R.string.service_created, notification);
	}

	private void hideNotification() {
		mNM.cancel(R.string.service_created);
	}

	// ----------------------------------------------------------------------

	/**
	 * Example of explicitly starting the {@link ServiceStartArguments}.
	 * 
	 * <p>
	 * Note that this is implemented as an inner class only keep the sample all
	 * together; typically this code would appear in some separate class.
	 */
	public static class Controller extends Activity {
		@Override
		protected void onCreate(Bundle savedInstanceState) {
			super.onCreate(savedInstanceState);

			setContentView(R.layout.service_start_arguments_controller);

			// Watch for button clicks.
			Button button = (Button) findViewById(R.id.start1);
			button.setOnClickListener(mStart1Listener);
			button = (Button) findViewById(R.id.start2);
			button.setOnClickListener(mStart2Listener);
			button = (Button) findViewById(R.id.start3);
			button.setOnClickListener(mStart3Listener);
			button = (Button) findViewById(R.id.startfail);
			button.setOnClickListener(mStartFailListener);
			button = (Button) findViewById(R.id.kill);
			button.setOnClickListener(mKillListener);
		}

		private OnClickListener mStart1Listener = new OnClickListener() {
			public void onClick(View v) {
				startService(new Intent(Controller.this,
						ServiceStartArguments.class).putExtra("name", "One"));
			}
		};

		private OnClickListener mStart2Listener = new OnClickListener() {
			public void onClick(View v) {
				startService(new Intent(Controller.this,
						ServiceStartArguments.class).putExtra("name", "Two"));
			}
		};

		private OnClickListener mStart3Listener = new OnClickListener() {
			public void onClick(View v) {
				startService(new Intent(Controller.this,
						ServiceStartArguments.class).putExtra("name", "Three")
						.putExtra("redeliver", true));
			}
		};

		private OnClickListener mStartFailListener = new OnClickListener() {
			public void onClick(View v) {
				startService(new Intent(Controller.this,
						ServiceStartArguments.class)
						.putExtra("name", "Failure").putExtra("fail", true));
			}
		};

		private OnClickListener mKillListener = new OnClickListener() {
			public void onClick(View v) {
				// This is to simulate the service being killed while it is
				// running in the background.
				Process.killProcess(Process.myPid());
			}
		};
	}
}
